Because if it can't be exploited by h. sapiens then it might as well not exist? Who made you the center of the universe? How selfish can you really be before the irony gets too thick and you start laughing? A plant exists to reproduce, grow and populate its environment. Don't start thinking it matters to the species of plant as a whole if some hairless monkeys start eating some of them. I ask, To what use are we to corn? Why do we exist at all if corn cannot use us?
If these foods are not for human consumption, then what is their purpose? Mark argues that not even cattle or livestock should be eating these items as feed, either.
In my mind all these plants must have a purpose, but if not to be eaten, then why do they exist? What use do they have?
Steak, eggs, potatoes - fruits, nuts, berries and forage. Coconut milk and potent herbs and spices. Tea instead of coffee now and teeny amounts of kelp daily. Let's see how this does! Not really had dairy much, and gut seems better for it.